A Growth Rate and Feed Habit Analysis of the Ciliate Euplotes sp. Contaminating a Mass Culture of the Rotifer Brachionus plicatilis

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概要

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• It has been observed that the ciliate Euplotes grows significantly in mass cultures of the rotifer Brachionus plicatilis when the cultures deteriorate. To reveal the growth factors of Euplotes sp., we carried out culture experiments with individually inoculated Euplotes sp. by using five different microbes preferred by the rotifer for food, and observed the intracellular contents of the ciliate by microscopy. Euplotes sp. showed high growth rates (μ_<max>;1.0〜2.0) on the food microbes including the inactive microalgae, Nannochloropsis oculata. However, active cells of N. oculata did not promote the growth of Euplotes sp., but significantly suppressed it compared with the control experiment of seawater alone. Furthermore, the active alga was never observed within the cells of Euplotes sp. These findings suggest that Euplotes sp. competes for dietal microbes preferred by B. plicatilis except for active N. oculata, and that active N. oculata is an effective food for preventing the proliferation of contaminated Euplotes sp. in a stable culture of the rotifer.

• 1998-06-30

著者

• Hino Akinori

  Fisheries Research Laboratory Faculty Of Agriculture University Of Tokyo

• Hino Akinori

  Fisheries Laboratory Faculty Of Agriculture The University Of Tokyo

• Maeda M

  Japan International Research Center For Agricultural Sciences

• USHILO MASAKAZU

  Department of Fisheries, Faculty of Agriculture, University of Tokyo

• MAEDA MASACHIKA

  Division of Bio-function, National Research Institute of Fisheries Science

• Ushilo Masakazu

  Department Of Fisheries Faculty Of Agriculture University Of Tokyo

関連論文

• Antagonistic Interactions between Microalga Nannochloropsis oculata (Eustigmatophyceae) and Ciliate Euplotes sp.
• A Growth Rate and Feed Habit Analysis of the Ciliate Euplotes sp. Contaminating a Mass Culture of the Rotifer Brachionus plicatilis
• Lethality of the Heliozoon Oxnerella maritima on the Rotifer Brachionus rotundiformis
• Nitrogen Flow in a Chemostat Culture of the Rotifer Brachionus plicatilis
• Measurements of the Nitrogen Budget in the Rotifer Brachionus plicatilis by Using^N
• Cryopreservation of Nauplius Larvae of the Barnacle, Balanus amphitrite Darwin
• Community Structure of Caprellid Amphipods (Crustacea) on Seagrasses in Otsuchi Bay, Northeastern Japan, with Reference to the Association of Caprella japonica (Schurin) and Phyllospadix iwatensis Makino

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